It is not a matter of graphical extras, if I may say, but what should be done is as follows:

rightclick bearshare.exe in c:\program files\Bearshare\
lefclick Properties
leftclick Compatibility tab
leftclick empty square next to the "Windows XP ..." (if that is your OS)
leftclick apply
leftclick OK

Now run the program and visualy everything should be fine

Still i have some conectivity issues, although during instalation of programs after installing Vista in one moment it worked just fine, now i have some problems which i hope to resolve soon.